Process for extracting resin from wood with the aid of oil of turpentine



E. SCHELLER PROCESS FOR 'EXTRACTING RESIN FROM WOOD WITH THE AID OF OIL 0F TURPENTINE Filed March 9. 1920 action of the oil of This invention has EDWARD SCHELLER, OF STOLP-UN-THE-P PROCESS FOR EX tat OM, GERMANY, ASSIGNOR TO ALBERT LUCK,

OF SLASSFURT-LEOPOLDSHALIL, GERMANY, A. FIRM.

TRACTING RESIN FROM WOOD WITH THE AID OF GIL 0F TUBPENTINE.

Application filed March 9, 1920. Serial No. 364,582.

7 '0 all who-m it may concern:

Be it known that I, citizen of the German Stolp-on-the-Pom, invented certain new and useful Processes for Extracti merits in EDWARD SCHELLER, a Republic, residing at German Republic, have Improveng Resin from "Wood with the Aid of Oil of lurpentine, of

This process and which the following is a specification. invention relates to an improved means for extracting the resin from the wood of conifers with the aid of oil of turpentine.

It is generally known to use the oil of turpentine as a means for extracting the resin from wood, but a thorough extraction of diiiicult or almost the resin has been hitherto very impossible. There have been proposed various complicated methods of procedure in order to obtain a. thorough b extraction; it has posed to submit the for example been prowood to a vacuum and then to eiiect the extraction under pressure,

under .heat

and through injecting heated air under pressure in order to complete the turpentine. for its object to simplify such methods and consequently the means or apparatus t whereby less of installation as or carrying out the process work isrequired, and the cost well as the working expenses are considerably reduced as neither pressure nor vacuum are required.

The invention is based upon the idea of using a temperature of from 140 to 150 during the time the wood is being submitted to the action of the oil of turpentine. At this temperature wood is expe all the water contained in the lled from the wood as steam "so that the oil of turpentine can penetrate into the smallest necessary .to

pores of the wood and dissolve longer cut the wood. into small pieces,

as it had to be done with the known extracting methods. The impro The wood blocks is brought ved process is as follows:- cut into rather large pieces or into a double-walled receptacle whereupon it is overfloated with oil of turpentine which comes from a reservoir in which the to 140 C.

contained in condenser in turpentine.

oil has been previously heated The double walled receptacle is heated also to 140-150" C. The water wood is thus rapidly exsteam escapes into the the The steam is condensed in the condenser and the oil of turpentine separated from the water is retained in the reservoir. After the waterhas been expelled from the wood the oil of turpentine can penetrate easily into even the finest pores of the wood and extract the resin. The oil of turpentine saturated with resin flows back from the double-walled receptacle into the reservoir. This overfloating ofthe wood by oil of turpentine from the reservoir is continued until all the resin has been extracted from the wood and the oil of turpentine is used repeatedly until its specific gravity has no longer increased when the oil returns from the double-walled receptacle.

The solution of resin in oil of turpentine is now, heated in the reservoir up to the oiling point and the oil vapour is used again in the double-walled receptacle after having been condensed. The temperature of the condensed oil vapour has to be brought to-140 C. before it is admitted into the receptacle. This treatment of the wood by oil of turpentine is repeated until no longer any resin in the wood, whereupon the oil of turpentine is driven out of the wood with the aid of steam. v

The oil of turpentine is separated from the solution contained in the reservoir and the residues can be utilized as raw colophony.

An apparatus for proved process is shown in the accompanying drawing by way of example.

The vessel A contains the oil of turpentine, the receptacles B and C are filled with roughly cut wood. To start the extraction so much oil of turpentine is pumped into the receptacle B until the same is nearly filled. Valves 4 and 7 in the supply pipes for receptacles B, C and the valves 8 and 20 in the steam pipes leading from the said receptacles areclosed, the air valve 2 of the oil vessel A being opened sufficiently to admit the amount of air which is required for pressing the oil into receptacle B. All the other valves of the plant are closed.

After the valve 7 has been closed, steam is admitted into the steam jacket .K, in order to heat the contents of receptacle B up to 140-150. The water which is thus driven out of the wood escapes as steam with part of the oil of turpentine through the outlet pipe e into the condenser. The wood is thoroughly impregnated with oil of turpentine and the resin is thus extracted for there is the largest part. The valve 2 is closed and the'valve 19 in the outlet pipe f at the loottom of vessel B is opened. The oil of turpentine with the extracted resin flows back into the vessel A which has-in the meantime-been heated up to 140-150". The pumping of oil of turpentine into receptacle B is repeated several times until the specific gravity does not increase any more which can he ascertained by drawing of? a specimen of the oil through the cook 22. After the valves 3, 7 and 9 have been opened. and valves 4 and 8 closed, steam is admitted into the steam jacket a of vessel A in order to heat the oil of turpentine to the boiling point so that it flows through the feeding pipes 0, d into the receptacle B. The oil vapor has to arrive in the said receptacle B at a condensed state and cooled to about 150. If this cannot be attained without special auxiliary devices, a retarding device must be arranged before the valve *3 of receptacle B, in order to-prevent the carbonization of the Wood. The oil otturpentine flows over the wood and out of the receptacle B through the outlet pipe f which leads the oil hack to the vessel A. Remainders of water vapor admixed with oil of turpentine pass through pipe e into the condenser. After a treatment during several hours all the resin has been extracted from the wood and a specimen taken at cock 22 shows that the oil is colourless. The steam is shut ofi from jacket a, valves 7 and 19 are closed and the valves 13 and 14 are opened to let off any excessive pressure which should still exist. The wood in receptacle B contains only pure oil of turpentine which is expelled by means. of steam,

eeaace and flows out through the escape pipe c after the valves 6 and 19 have been opened.

The extraction in B is finished and the Wood in receptacle G can now be treated in the same manner as just described. After the receptacle B has been cooled it is emptied through the outlet g.

If the oil of turpentine in the vessel A is suiiicieutly saturated with resin the oil is distilled through the conduit pipes c, d after the corresponding valves have been opened and the residues consistinglof raw colophony are let ofi through cock 1.

I claim i An improved cyclic process of extracting resin from wood through extraction with oil of turpentine 140-150 G. the contents of a double-walled receptacle filled with wood pieces and with oil oi turpentine allowing vapors of steam carrying some of the oil to escape, the re maining oil penetrating into the pores er the wood to dissolve the resin, permitting oil saturated with resin to flow back to an oil reservoir where it is heated to 140 C. and conducting it back to the double-walled receptacle, this procedure being repeated until the specific gravityvof the oil saturated with resin does not increase any more, driving oil of turpentine out of the Wood by means of steam, separating oil of turpentine saturated with resin contained in the oil reservoir into oil and resin.

in testimony whereof I aliix my signature in presence of two witnesses.

Dn. EDWARD SCHELLER. Witnesses Louis D'OBENZIG,-

Orro Hesse.

consisting in heating up to 

